If the size of a population increases drastically,

A) more coalescent events occur near the tips.
B) more coalescent events occur near the base of the tree.
C) the rate of coalescence accelerates.
D) coalescent events are distributed evenly through time.

When a population size increases drastically, coalescent events are more likely to occur near the base of the tree. This is because a larger population size reduces the probability of any two lineages coalescing in the recent past, pushing the common ancestors further back in time.